求翻译：4.其他原因：在于人口结构老龄化：二战以来人口结构变化更加剧烈，从20世纪末开始欧洲大多数国家的人口结构都进入了快速老龄化的阶段。老龄化使生产人口下降，消费人口增加，慢慢入不敷出，最终出现了危机。是什么意思？

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4. other reasons: Lies in the population structure aging: Since World War II the population structure change has been fiercer, starts the European majority country population structure from 20 century's ends all to enter the fast aging stage.The aging causes the production population to drop, expend

4. other reasons: is demographic ageing: demographic change is even more acute since the second world war, from the late 20th century most of Europe's population structure has entered a stage of rapid aging. Aging the production decline, consumption increased, slowly beyond their means, and will eve

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